Atomization device

ABSTRACT

An atomizer is provided having an atomization chamber ( 1, 2; 1 ′) for receiving a liquid, at least one nebulizer ( 3, 4; 4 ′) for atomizing the liquid into drops of liquid, and an exit port ( 30 ) for discharging the vapor or mist of liquid thus generated from the atomization chamber ( 1, 2; 1 ′). At least one device for deflecting the vapor or mist of liquid ( 5; 5 ′) is provided, which is arranged in the area above the liquid surface.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a Section 371 of International Application No.PCT/AT2012/050188, filed Nov. 30, 2012, which was published in theGerman language on Jun. 6, 2013, under International Publication No. WO2013/078495 A1 and the disclosure of which is incorporated herein byreference.

BACKGROUND OF THE INVENTION

The invention relates to an atomizer having an atomization chamber forreceiving a liquid and at least one nebulizer for atomizing the liquidinto drops of liquid, as well as an exit port for discharging the vaporor mist of liquid thus generated from the atomization chamber.

For the purpose of killing dangerous particles such as viruses, spores,bacteria, etc. in rooms or for the disinfection of rooms and surfaces,the vapor or mist of liquid discharged by such a known atomizer isallowed to react in a room or surroundings. For example, a liquidsuitable for disinfection is distributed evenly in the ambient air inthe form of droplets, as an aerosol, so that it encounters, for example,infectious particles, in the air or on surfaces, which infectiousparticles are rendered innocuous by the disinfecting effect of theliquid.

Droplet size and their size distribution have been disadvantageous up tonow because they are controllable only very poorly by conventionalatomizers. The atomization process by ultrasonic transformers producesnot only small droplets, but also bigger ones that deposit relativelystrongly on surfaces, which is undesirable because it creates humiditywhich can be disadvantageous in various aspects. Sensitive surfaces maybe destroyed, or a corrosion process may be initiated on valuableobjects or instruments.

The smaller the droplet size can be kept, the less humidity or liquiddeposition develops in the surroundings where the atomizer is to takeeffect.

BRIEF SUMMARY OF THE INVENTION

It is thus the object of the invention to provide an atomizer of theabove type, by which a mist of liquid having a droplet diameter as smallas possible can be discharged into the surroundings.

According to the invention this is achieved by arranging at least onedevice for deflecting the vapor or mist of liquid in the area above theliquid surface.

A deposition of droplets having larger diameters is formed on thisdeflecting device, so that a mist of liquid having substantially smallerdroplets remains.

The average diameter of the droplets of liquid can thus be reduced toless than 1 μm, so that a mist of liquid is created that is felt to bevery dry, and thus in the following referred to as dry vapor, which doesnot form any film of moisture on the surface to be treated that couldlead to the development of mold or rust.

In contrast to common devices based on vapor, however, the liquid doesnot have to be heated for generating the dry vapor.

In a further embodiment of the invention the at least one device fordeflecting the vapor or mist of liquid can be formed by a turbulenceshield arranged above the liquid level in the interior of theatomization chamber, at which larger liquid droplets can form aprecipitate and run or drip off.

In order to remove larger droplets very efficiently, the turbulenceshield can, according to a further embodiment of the invention, have ahorizontal wall section and a wall section connected thereto andinclined towards the liquid surface, wherein the inclined wall sectionis especially well suited for deflecting the created dry vapor towardsthe exit port and at the same time allowing the larger droplets to beseparated, wherein deposited droplets run or drip back into, forexample, a tub in which the liquid is received.

In particular, when according to a further embodiment of the invention,the inclined wall section extends above the at least one nebulizer,which is arranged in the bottom area of the atomization chamber, thisallows an extremely strong reduction of the proportion of large dropletdiameters in the created dry vapor.

In this connection it has proven especially preferable to have theinclined wall section inclined at an angle of β1 with regard to thehorizontal, with β1 being in the range of 10° to 45°.

In order to draw off the mist of liquid freed from the larger droplets,a through-flow is introduced which sets the created aerosol into motion.

For this purpose, according to another exemplary embodiment of theinvention, an opening is formed in the atomization chamber, throughwhich an airflow can be passed over the liquid surface.

Advantageously, it can be provided that the free end of the turbulenceshield projecting into the atomization chamber is arranged at a distancefrom a side wall of the atomization chamber forming an openingcross-section, so that the atomization chamber is separated into anupper and a lower area except for the opening cross-section.

Furthermore, a pressure device may be arranged in the upper area of theatomization chamber, via which the pressure within the atomizationchamber is increased to create an airflow.

In a further embodiment of the invention, the pressure device can beformed by at least one fan, via which air is blown into the atomizationchamber from the surroundings, so that an airflow is created through theopening cross-section, which moves the vapor or mist of liquid ascendingfrom the liquid towards the exit port.

According to another embodiment, the exit port can be formed at one endof a discharge box having a rectangular pipe cross-section extendingupwards. The mist of liquid freed from larger droplet diameters isdischarged to the surroundings via this discharge box. Also, instead ofthe rectangular pipe cross-section a different, for example circular,cross-section can be contemplated.

A further fluid-engineering measure for reducing the proportion ofdroplets of liquid having large diameters can be provided by forming anacceleration prism in the area of the exit port that projects above theliquid level.

It is especially preferred that the acceleration prism be formed by twolegs in the form of an inverted V cross section, wherein the legs areinclined with regard to the vertical at an angle of δ1.

In order to allow further removal of droplets having larger diametersfrom the mist of liquid, it can be provided that the acceleration prismwith its leg facing the exit port forms a cross-sectional narrowinghaving a width of a1 of the atomization chamber.

Finally, an increase of the exit velocity of the mist of liquid isguaranteed by the fact that, according to a further development of theinvention, a rectangular flow hollow profile is arranged on at least oneside of the discharge box, the lower end of which is connected to theupper part of the atomization chamber, so that a partial flow of thepressure device is led through the flow hollow profile.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The foregoing summary, as well as the following detailed description ofthe invention, will be better understood when read in conjunction withthe appended drawings. For the purpose of illustrating the invention,there are shown in the drawings embodiments which are presentlypreferred. It should be understood, however, that the invention is notlimited to the precise arrangements and instrumentalities shown. In thedrawings:

FIG. 1 is a top perspective view showing an atomizer according to oneembodiment of the invention;

FIG. 2 is a sectional view perpendicular to the longitudinal axisthrough the atomizer according to FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 4;

FIG. 4 is a lateral view of the embodiment of FIG. 1;

FIG. 5 is a top view of an atomizer according to another embodiment ofthe invention;

FIG. 6 is a sectional view taken along line AA of FIG. 5;

FIG. 7 is an enlarged view of the detail B of FIG. 6; and

FIG. 8 is a top perspective view of the embodiment of FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 to 4 show an embodiment of an inventive atomizer by which aliquid can be atomized and delivered to the surroundings in the form ofdroplets of liquid, for example to decontaminate or disinfect a room, inthat the droplets of liquid destroy particles floating in the air oradhering to surfaces so that they become ineffective for humans oranimals, which prevents them from attacking cells and exerting theirdetrimental effects there. Food or computer keyboards, for example, canalso be freed from dangerous germs or other particles by exposing themto mist or vapor of liquid discharged by the inventive atomizer.

Irrespective of the type of particles, such as viruses, fungi, bacteria,etc., the atomizer expels a continuous flow of droplets of liquid, whichspread correspondingly and exert their disinfecting effect. The liquidto be atomized can, for example, be hydrogen peroxide, but other liquidsor mixtures of liquids or pure water, which has no disinfecting effect,can also be atomized.

The atomizer shown in FIGS. 1 to 4 is enclosed by a housing 180 and hastwo atomization chambers 1, 2 in its interior for receiving the liquid,which atomization chambers 1, 2 are arranged mirror-symmetrically withregard to the central plane, as may be seen in FIG. 2. It is alsopossible to provide only one or more than two atomization chamberswithout affecting the mode of action of the atomizer.

During operation, the two atomization chambers 1, 2 are filled with aliquid up to a predetermined liquid level. For this purpose, the bottomarea of the atomization chambers 1, 2 has a tub-like shape. When thelevel has fallen to a certain extent, a refill is required.

In parallel with the longitudinal axis of the atomizer, respectivepluralities of adjacently arranged nebulizers 3, 4 are provided in theatomization chambers 1, 2 (FIG. 4), in the shown example e.g. asultrasonic nebulizers. Within the framework of the invention, however, adifferent type of atomization, e.g. an electrostatic form, can also beused.

The nebulizers 3, 4, which can, for example, be provided aspiezoelectric elements, are recessed into the bottom of the atomizationchambers 1, 2, so that they contact the liquid with their vibrationbodies and set it into vibration. Thus, an atomization process takesplace during which small droplets dissociate from the liquid surface andare cast upwards, which forms an aerosol.

For improving the mode of action of the nebulizers 3, 4, asound-reflecting cone 19 is formed between them and the chamber bottom,by which the sound waves produced by the nebulizers 3, 4 are bundled.The cone 19 can, however, also be emitted.

A cone angle φ1 (FIG. 3) in the range of 15° to 80° has provenparticularly advantageous, but other angle values may also be used.

The developing dry vapor moves through an exit port 30, which is formedat the lower end of a discharge box 70, which is divided into twopartial boxes in the exemplary embodiment shown in FIGS. 1 to 4, havinga rectangular pipe cross-section extending upwards.

According to the invention, a device for deflecting the vapor or mist ofliquid 5 is provided, which is arranged in the area above the liquidsurface.

In the exemplary embodiment that is shown the device for deflecting thevapor or mist of liquid 5 is formed by a turbulence shield 50 arrangedabove the liquid level in the interior of the atomization chambers 1, 2,which shield has a horizontal wall section 6 and a wall section 7connected thereto and inclined towards the liquid surface. However, adifferent type of deflection may also be provided.

The inclined wall section 7 extends above the nebulizers 3, 4, which arearranged in the bottom area of the atomization chamber 1, 2, and isinclined at an angle of β1 with regard to the horizontal, with β1 beingin the range of 10° to 45°. In FIGS. 2 and 3, the angle β1 is chosen tobe 40°.

Dry vapor ascending from the liquid surface is deflected by the inclinedwall section 7 towards the exit port 30. Larger droplets adhere to theunderside of the inclined wall section 7 and run off along the inclinedwall section 7 downwards towards the liquid. The rest of the mist thuscontains fewer droplets having large diameters, so that it can bereferred to as dry vapor.

The free ends of the turbulence shield 50 projecting into theatomization chambers 1, 2 are each arranged at a distance from a sidewall 93 of the atomization chambers 1, 2 forming opening cross-sections,so that the atomization chambers 1, 2 are separated into an upper and alower area except for the opening cross-section. Respective pressuredevices 80 may be arranged in the upper areas of the atomizationchambers, via which the pressure within the atomization chambers 1, 2 isincreased during operation.

The pressure device 80 is formed by one or more fans 81 via which air isblown into the atomization chamber from the surroundings, so that anairflow is created through the opening cross-section 40, which moves thevapor or mist of liquid ascending from the liquid towards the exit port30.

An acceleration prism 45 is formed in the area of the exit port 30 thatprojects above the liquid level and is formed by two legs 46, 47 in theform of an inverted V cross section, wherein the legs 46, 47 areinclined with regard to the central axis or the vertical at an angle ofδ1. The angle of δ1 may be in a preferred range of 0° to 60°.

At this acceleration prism 45, atomized droplets of fluid having alarger diameter also form a deposition, while the finer droplets reachthe exit port 30 via this acceleration prism 45. Simultaneously, theacceleration prism 45 with its leg 47 facing the exit port 30 and thelower end of the discharge box 70 forms a tapering cross-sectionalnarrowing having a width of a1 at the lower edge of the discharge box70. The exit port 30 is at approximately halfway up the accelerationprism 45. The cross-sectional narrowing width a1 can preferably beselected in a range of 1 mm to 15 mm, but other dimensions are alsopossible. The design of the acceleration prism 45 can also be differentwithin the framework of the invention and can, for example, be formedwithout being supported on the tub bottom.

Altogether, the atomized droplets of liquid are moved under the effectof the airflow (arrow 110) created by the pressure device as an aerosolflow (arrow 111) towards the exit port 30, through which they arrive inthe discharge box 70, through which they arrive at the upper end of thedischarge box 70 (arrow 113), where a discharge opening 71 is formed,through which the dry vapor is discharged to the surroundings.

The lower end of the discharge box 70 can also be expanded, as is shownby the angle of α1, which in the exemplary embodiment shown is 0°. α1 inthe range of 0° to 45° has proven to be preferable.

An additional measure for accelerating the exit of the mist of fluidfrom the discharge opening 71 is the arrangement of rectangular flowhollow profiles 73 on the longitudinal sides of the discharge box 70,the lower ends of which are each connected to the upper parts of theatomization chambers 1, 2, so that a partial flow (arrow 112) of thepressure device 80 is introduced into the flow hollow profile and ledtherethrough (arrow 114), so that a suction effect at the dischargeopening 71 of the discharge box 70 occurs, which increases the exitvelocity of the dry vapor.

FIGS. 5 to 8 show a further exemplary embodiment of the inventiveatomizer having a cylindrical housing 180′, which receives a circularatomization chamber 1′. A deflection device 5′ having the shape of ahollow truncated cone is arranged in the area above the liquid surface.In addition, a circular acceleration prism 45′ is arranged in the areaof the exit port 30, which is formed by the lower end of ahollow-cylindrical discharge pipe 70′. The nebulizers 3′ are in acircular arrangement. The mode of action corresponds to the embodimentsshown in FIGS. 1 to 4. Similarly, the angle ranges for α1, β1, δ1, φ1and the width ranges a1 given as preferred ranges are also preferred forthe exemplary embodiment according to FIGS. 5 to 8, so that the anglesshown in FIGS. 5 to 8 are merely to be regarded as possible variations.

It will be appreciated by those skilled in the art that changes could bemade to the embodiments described above without departing from the broadinventive concept thereof. It is understood, therefore, that thisinvention is not limited to the particular embodiments disclosed, but itis intended to cover modifications within the spirit and scope of thepresent invention as defined by the appended claims.

The invention claimed is:
 1. An atomizer comprising: an atomizationchamber for receiving a liquid; at least one nebulizer for atomizing theliquid into a vapor; and an exit port for discharging the vapor thusgenerated from the atomization chamber, wherein at least one device fordeflecting the vapor is arranged in an area above a surface of theliquid, wherein an acceleration prism formed in an area of the exit portprojects above the liquid level and is arranged such that across-sectional narrowing of the atomization chamber is formed, whereinthe at least one device for deflecting the vapor comprises a turbulenceshield arranged above the liquid surface in an interior of theatomization chamber, a free end of the turbulence shield projecting intothe atomization chamber is arranged at a distance from a side wall ofthe atomization chamber to form an opening cross-section, such that theatomization chamber is separated into an upper region and a lower regionexcept for the opening cross-section, wherein the turbulence shield hasa horizontal wall section and an inclined wall section connected theretoand inclined towards the liquid surface, and wherein the vapor ascendingfrom the liquid is moved towards the exit port via a pressure devicearranged in the upper region of the atomization chamber, via whichpressure within the atomization chamber is increased, the pressuredevice comprising at least one fan, via which air is blown into theatomization chamber from its surroundings, such that an airflow iscreated through the opening cross-section, which moves the vaporascending from the liquid towards the exit port.
 2. The atomizeraccording to claim 1, wherein the acceleration prism comprises two legsin a form of an inverted V cross section, and wherein thecross-sectional narrowing is formed in an area of one of the legs of theacceleration prism facing the exit port.
 3. The atomizer according toclaim 2, wherein the legs are inclined at an angle δ1 of 0° to 60° withrespect to vertical.
 4. The atomizer according to claim 1, wherein thecross-sectional narrowing of the atomization chamber has a width a1 of 1mm to 15 mm.
 5. The atomizer according to claim 1, wherein the inclinedwall section extends above the at least one nebulizer, which is arrangedin a bottom area of the atomization chamber.
 6. The atomizer accordingto claim 5, wherein the inclined wall section is inclined at an angle β1in a range of 10° to 45° with respect to horizontal.
 7. The atomizeraccording to claim 1, wherein the exit port is formed at one end of adischarge box having a rectangular pipe cross-section extending upwards.8. The atomizer according to claim 7, wherein a rectangular flow hollowprofile is arranged on at least one side of the discharge box, a lowerend of the flow hollow profile being connected to the upper region ofthe atomization chamber, such that a partial flow of the pressure deviceis led through the flow hollow profile.